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Title: A spin-orbit alignment for the hot Jupiter HATS-3b

We have measured the alignment between the orbit of HATS-3b (a recently discovered, slightly inflated Hot Jupiter) and the spin axis of its host star. Data were obtained using the CYCLOPS2 optical-fiber bundle and its simultaneous calibration system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The sky-projected spin-orbit angle of λ = 3° ± 25° was determined from spectroscopic measurements of the Rossiter-McLaughlin effect. This is the first exoplanet discovered through the HATSouth transit survey to have its spin-orbit angle measured. Our results indicate that the orbital plane of HATS-3b is consistent with being aligned to the spin axis of its host star. The low obliquity of the HATS-3 system, which has a relatively hot mid F-type host star, agrees with the general trend observed for Hot Jupiter host stars with effective temperatures >6250 K to have randomly distributed spin-orbit angles.
Authors:
; ;  [1] ;  [2]
  1. Exoplanetary Science Group, School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
  2. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611 (Australia)
Publication Date:
OSTI Identifier:
22365128
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALIGNMENT; CALIBRATION; HOST; OPTICAL FIBERS; ORBITS; RADIAL VELOCITY; RANDOMNESS; SATELLITES; SPIN; STABILITY; STAR EVOLUTION; TELESCOPES